Just an armchair contemplation, not based on any experience: The incandescent light has a continuous spectrum, obviously with some bias towards red. The LED spectrum might be somewhat discontinuous as it (as far as I know) is composed of distinct narrow(ish) colours that together look "white" to our sight. The emulsion of your colour paper is also made up of three(I think) different coloured emulsions each with its somewhat narrow spectral sensitivity. Maybe if the colours that make up the LED "white" don't line up well with the three colours of the paper emulsion then could it cause anomalies with the filtration? I don't know, just musing.

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